diff --git a/core/math/parser/parser-docs.factor b/core/math/parser/parser-docs.factor
index bcc75a842a..ba0df3e357 100644
--- a/core/math/parser/parser-docs.factor
+++ b/core/math/parser/parser-docs.factor
@@ -25,7 +25,7 @@ $nl
 ABOUT: "number-strings"
 
 HELP: digits>integer
-{ $values { "seq" "a sequence of integers" } { "radix" "an integer between 2 and 36" } { "n" integer } }
+{ $values { "seq" "a sequence of integers" } { "radix" "an integer between 2 and 36" } { "n/f" { $maybe integer } } }
 { $description "Converts a sequence of digits (with most significant digit first) into an integer." }
 { $notes "This is one of the factors of " { $link string>number } "." } ;
 
diff --git a/core/syntax/syntax-docs.factor b/core/syntax/syntax-docs.factor
index bb8791df97..33a0096ff9 100644
--- a/core/syntax/syntax-docs.factor
+++ b/core/syntax/syntax-docs.factor
@@ -66,6 +66,12 @@ ARTICLE: "syntax-floats" "Float syntax"
     "7.e13"
     "1.0e-5"
 }
+"There are three special float values:"
+{ $table
+{ "Positive infinity" { $snippet "1/0." } }
+{ "Negative infinity" { $snippet "-1/0." } }
+{ "Not-a-number" { $snippet "0/0." } }
+}
 "More information on floats can be found in " { $link "floats" } "." ;
 
 ARTICLE: "syntax-complex-numbers" "Complex number syntax"