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-rw-r--r--nn/tools/api/README.md6
1 files changed, 4 insertions, 2 deletions
diff --git a/nn/tools/api/README.md b/nn/tools/api/README.md
index e059821e8..fe4dd482f 100644
--- a/nn/tools/api/README.md
+++ b/nn/tools/api/README.md
@@ -127,8 +127,10 @@ generated output file.
#### `%define *name* *body*`
Defines a macro identified by the token *name*. The *body* is separated from
-the *name* by whitespace, and extends to the end of the line -- it may contain
-whitespace itself.
+the *name* by exactly one whitespace character, and extends to the end of the
+line -- it may contain whitespace itself. For example,
+
+ %define test this body begins and ends with a space character
Macro substitution occurs within a definition region or a section region: a
substring `%{*name*}` is replaced with the corresponding *body*. Macro