diff --git a/src/renderer/components/Feedback/FeedbackPanel.css b/src/renderer/components/Feedback/FeedbackPanel.css
index 9014e54..0f00091 100644
--- a/src/renderer/components/Feedback/FeedbackPanel.css
+++ b/src/renderer/components/Feedback/FeedbackPanel.css
@@ -628,3 +628,33 @@
   text-align: right;
   flex-shrink: 0;
 }
+
+.pm-dim-info {
+  display: inline-block;
+  margin-left: 4px;
+  font-size: 9px;
+  opacity: 0.4;
+  cursor: default;
+  vertical-align: middle;
+  line-height: 1;
+}
+
+.pm-dim-info:hover {
+  opacity: 0.9;
+}
+
+.pm-tooltip-fixed {
+  position: fixed;
+  transform: translate(-50%, -100%);
+  width: 220px;
+  background: var(--bg-panel, #1a1a1a);
+  border: 1px solid var(--border);
+  border-radius: 5px;
+  padding: 7px 9px;
+  font-size: 11px;
+  line-height: 1.5;
+  color: var(--text-primary);
+  white-space: normal;
+  z-index: 9999;
+  pointer-events: none;
+}
diff --git a/src/renderer/components/Feedback/FeedbackPanel.tsx b/src/renderer/components/Feedback/FeedbackPanel.tsx
index cdd060d..7642574 100644
--- a/src/renderer/components/Feedback/FeedbackPanel.tsx
+++ b/src/renderer/components/Feedback/FeedbackPanel.tsx
@@ -274,8 +274,26 @@ function scoreColor(score: number): string {
   return 'var(--polish-low)'
 }
 
+const DIM_DESCRIPTIONS: Record<string, string> = {
+  passiveVoice:     'Flags "was/were + past participle" constructions. Penalises above 12 per 1,000 words.',
+  weaselWords:      'Intensifiers like very, quite, clearly that weaken prose. Penalises above 10 per 1,000 words.',
+  adverbDensity:    '–ly adverbs per 1,000 words. Strong verbs rarely need adverb support. Penalises above 20 per 1,000.',
+  filterWords:      '"She felt", "he noticed" — constructions that put a layer between reader and action. Penalises above 8 per 1,000 words.',
+  showTell:         '"Was/were + emotion adjective" (was angry, were afraid). Suggests telling the reader rather than dramatising the moment.',
+  sentenceRhythm:   'Coefficient of variation in sentence lengths. High variance = good pacing. Also flags runs of 3+ sentences within 2 words of each other in length.',
+  paragraphRhythm:  'Variation in paragraph lengths. Flags walls of text over 150 words and measures overall length variance.',
+  repeatedStarters: 'Penalises 3+ consecutive sentences opening with the same word, and chapters heavy with pronoun openers (he/she/they).',
+  wordVariety:      'Type-token ratio over 100-word windows of content words. Low ratio = repetitive vocabulary. Also flags words repeated 3+ times within 50 words.',
+  cliches:          'Matches against a list of common literary clichés (heart pounding, blood ran cold, etc.). Penalises above 6 per 1,000 words.',
+  overusedWords:    'Drafting filler: just, suddenly, somehow, began to, started to. Penalises above 25 per 1,000 words.',
+  dialogueTags:     'Said-bookisms (hissed, snarled, barked) and adverb-modified tags (said softly). Penalises above 8 per 1,000 words.',
+}
+
+interface TooltipState { text: string; x: number; y: number }
+
 function PolishMeter({ score }: { score: PolishScore }): JSX.Element {
   const [activeKey, setActiveKey] = useState<string | null>(null)
+  const [tooltip, setTooltip] = useState<TooltipState | null>(null)
   const { setAnnotations, clearAnnotations } = useEditorStore()
 
   const dims = Object.entries(score.dimensions) as [string, PolishDimension][]
@@ -325,7 +343,20 @@ function PolishMeter({ score }: { score: PolishScore }): JSX.Element {
               onClick={() => clickable && handleDimClick(key, dim)}
               title={clickable ? `Click to highlight ${dim.issueCount} instance${dim.issueCount !== 1 ? 's' : ''}` : undefined}
             >
-              <span className="pm-dim-label">{dim.label}</span>
+              <span className="pm-dim-label">
+                {dim.label}
+                {DIM_DESCRIPTIONS[key] && (
+                  <span
+                    className="pm-dim-info"
+                    onClick={e => e.stopPropagation()}
+                    onMouseEnter={e => {
+                      const r = (e.currentTarget as HTMLElement).getBoundingClientRect()
+                      setTooltip({ text: DIM_DESCRIPTIONS[key], x: r.left + r.width / 2, y: r.top - 8 })
+                    }}
+                    onMouseLeave={() => setTooltip(null)}
+                  >ⓘ</span>
+                )}
+              </span>
               <div className="pm-bar-track">
                 <div
                   className="pm-bar-fill"
@@ -337,6 +368,14 @@ function PolishMeter({ score }: { score: PolishScore }): JSX.Element {
           )
         })}
       </div>
+      {tooltip && (
+        <div
+          className="pm-tooltip-fixed"
+          style={{ left: tooltip.x, top: tooltip.y }}
+        >
+          {tooltip.text}
+        </div>
+      )}
     </div>
   )
 }