diff --git a/README.md b/README.md
index d5dcab5..9c81f62 100644
--- a/README.md
+++ b/README.md
@@ -18,6 +18,7 @@ The following taxonomies are described:
 - [DHS CIIP Sectors](./dhs-ciip-sectors)
 - [eCSIRT](./ecsirt) and IntelMQ incident classification
 - [ENISA](./enisa) ENISA Threat Taxonomy
+- [Estimative Language](./estimative-language) Estimative Language (ICD 203)
 - [EU critical sectors](./eu-critical-sectors) - EU critical sectors
 - [EUCI](./euci) - EU classified information marking
 - [Europol Incident](./europol-incident) - Europol class of incident taxonomy
@@ -62,6 +63,10 @@ eCSIRT incident classification Appendix C of the eCSIRT EU project including Int
 
 ENISA Threat Taxonomy - A tool for structuring threat information [as published](https://www.enisa.europa.eu/topics/threat-risk-management/threats-and-trends/enisa-threat-landscape/etl2015/enisa-threat-taxonomy-a-tool-for-structuring-threat-information)
 
+### [Estimative Language](./estimative-language) Estimative Language (ICD 203)
+
+Estimative language - including likelihood or probability of event based on the Intelligence Community Directive 203 (ICD 203) (6.2.(a)).
+
 ### [EU Critical Sectors](./eu-critical-sectors)
 
 Market operators and public administrations that must comply to some notifications requirements under EU NIS directive.