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diff --git a/libcrystfel/src/symop.l b/libcrystfel/src/symop.l
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+/*
+ * symop.l
+ *
+ * Lexical scanner for symmetry operations
+ *
+ * Copyright © 2019 Deutsches Elektronen-Synchrotron DESY,
+ *                  a research centre of the Helmholtz Association.
+ *
+ * Authors:
+ *   2019 Thomas White <taw@physics.org>
+ *
+ * This file is part of CrystFEL.
+ *
+ * CrystFEL is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * CrystFEL is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with CrystFEL.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+%{
+  #define YYDEBUG 1
+  #include "rational.h"
+  #include "symop-parse.h"
+%}
+
+%option prefix="symop"
+%option noyywrap nounput noinput
+
+%%
+
+[,]        { return COMMA; }
+[0-9]+     { symoplval.n = atoi(yytext); return NUMBER; }
+[/]        { return DIVIDE; }
+[+]        { return PLUS; }
+[-]        { return MINUS; }
+[ahx]      { return H; }
+[bky]      { return K; }
+[clz]      { return L; }
+[(]        { return OPENB; }
+[)]        { return CLOSEB; }
+[;]        { return SEMICOLON; }
+
+%%