X-Git-Url: https://git.rrq.au/?a=blobdiff_plain;f=adoc%2Fp_0branch.adoc;h=6488d62ab6c305c4c421abd782609db3eaeab75a;hb=4dcbbfcdec1f956b9fe016b4e742f8c57837ab2c;hp=27d338d60515d9f95453d1ffff31d2ae36de97ca;hpb=d5a8f559318ac57934871a48e964bac18557b601;p=rrq%2Frrqforth.git

diff --git a/adoc/p_0branch.adoc b/adoc/p_0branch.adoc
index 27d338d..6488d62 100644
--- a/adoc/p_0branch.adoc
+++ b/adoc/p_0branch.adoc
@@ -1,6 +1,6 @@
 // contorl.asm:	WORD p_zero_branch,'0BRANCH',fasm
 
-anchor:p_zero_branch[]
+anchor:p_0branch[]
 
 === Word: 0BRANCH
 
@@ -14,3 +14,13 @@ the point of execution. If the value, v, is 0 then the branch offset
 is added, and otherwise execution continues with the cell following
 the branch offset in the definition.
 
+Note that the branch offset is a byte count and each FORTH word of a
+definition take up a cell of 8 bytes. The offset is relative to the
+cell address immediately subsequent to the offset cell. In other
+words, offset 0 is not branching anywhere and an offset of -16 would
+make a tight loop back to the branch instruction itself. The latter
+would pull data stack values until and including the first non-zero
+value.
+
+See also <<p_1branch,1BRANCH>>, <<p_branch,BRANCH>>, <<p_if,IF>>,
+<<p_else,ELSE>>, <<p_ifbreak,IFBREAK>> and <<p_ifagain,IFAGAIN>>.