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-rw-r--r--src/doc/unstable-book/src/library-features/asm.md2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/doc/unstable-book/src/library-features/asm.md b/src/doc/unstable-book/src/library-features/asm.md
index b7e10734c57..297256688e7 100644
--- a/src/doc/unstable-book/src/library-features/asm.md
+++ b/src/doc/unstable-book/src/library-features/asm.md
@@ -564,7 +564,7 @@ Here is the list of currently supported register classes:
 | AArch64 | `preg` | `p[0-15]`, `ffr` | Only clobbers |
 | ARM (ARM) | `reg` | `r[0-12]`, `r14` | `r` |
 | ARM (Thumb2) | `reg` | `r[0-12]`, `r14` | `r` |
-| ARM (Thumb1) | `reg` | `r[0-r7]` | `r` |
+| ARM (Thumb1) | `reg` | `r[0-7]` | `r` |
 | ARM (ARM) | `reg_thumb` | `r[0-r12]`, `r14` | `l` |
 | ARM (Thumb2) | `reg_thumb` | `r[0-r7]` | `l` |
 | ARM (Thumb1) | `reg_thumb` | `r[0-r7]` | `l` |