1 files changed, 42 insertions, 0 deletions
diff --git a/iredis/data/commands/incrbyfloat.md b/iredis/data/commands/incrbyfloat.md
new file mode 100644
index 0000000..4998f5f
--- /dev/null
+++ b/iredis/data/commands/incrbyfloat.md
@@ -0,0 +1,42 @@
+Increment the string representing a floating point number stored at `key` by the
+specified `increment`. By using a negative `increment` value, the result is that
+the value stored at the key is decremented (by the obvious properties of
+addition). If the key does not exist, it is set to `0` before performing the
+operation. An error is returned if one of the following conditions occur:
+
+- The key contains a value of the wrong type (not a string).
+- The current key content or the specified increment are not parsable as a
+  double precision floating point number.
+
+If the command is successful the new incremented value is stored as the new
+value of the key (replacing the old one), and returned to the caller as a
+string.
+
+Both the value already contained in the string key and the increment argument
+can be optionally provided in exponential notation, however the value computed
+after the increment is stored consistently in the same format, that is, an
+integer number followed (if needed) by a dot, and a variable number of digits
+representing the decimal part of the number. Trailing zeroes are always removed.
+
+The precision of the output is fixed at 17 digits after the decimal point
+regardless of the actual internal precision of the computation.
+
+@return
+
+@bulk-string-reply: the value of `key` after the increment.
+
+@examples
+
+```cli
+SET mykey 10.50
+INCRBYFLOAT mykey 0.1
+INCRBYFLOAT mykey -5
+SET mykey 5.0e3
+INCRBYFLOAT mykey 2.0e2
+```
+
+## Implementation details
+
+The command is always propagated in the replication link and the Append Only
+File as a `SET` operation, so that differences in the underlying floating point
+math implementation will not be sources of inconsistency.