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-rw-r--r--doc/primitive.md2
1 files changed, 1 insertions, 1 deletions
diff --git a/doc/primitive.md b/doc/primitive.md
index cef1a13c..3a2d72a6 100644
--- a/doc/primitive.md
+++ b/doc/primitive.md
@@ -45,7 +45,7 @@ Functions that have significant differences from APL functions are marked with a
| `⍒` | [Grade Down](https://aplwiki.com/wiki/Grade) | [Bins Down](https://aplwiki.com/wiki/Interval_Index)
| `⊏` | First Cell* | Select*
| `⊑` | [First](https://aplwiki.com/wiki/First) | Pick*
-| `⊐` | | [Index of](https://aplwiki.com/wiki/Index_Of)
+| `⊐` | Classify* (`⍷⊸⊐`) | [Index of](https://aplwiki.com/wiki/Index_Of)
| `⊒` | Occurrence Count* | Progressive Index of*
| `∊` | [Unique Mask](https://aplwiki.com/wiki/Nub_Sieve) | [Member of](https://aplwiki.com/wiki/Membership)
| `⍷` | [Deduplicate](https://aplwiki.com/wiki/Unique) | [Find](https://aplwiki.com/wiki/Find)